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2,910,488 ANILINE DERIVATIVES 2,910,488 Patented Oct. 27, 1959 ministered in therapeutic dosages in conventional vehicles as in the form of tablets, pills, capsules, and the like as these compounds are efiective upon oral. administration. As the compounds of this invention also are soluble in a 5 a dilute alkaline medium or in polyethylene glycol, inject- Frederick C. Novello, Lansdale, Pa., assignor to Merck & able Solutions can be Prepared for Parenteral administra- Co., Inc., Rahway, N.J., a corporation of New Jersey tion bydissolving the compound in the selected medium N Drawing Application January 22, 1958 to which preservatives can be added if desired.

Serial 710,385 Dosages between about to about l0 mg./kg./day generally are suitable to produce a diuretic response. Of 7 Claims (CL 260-497) course, more or less of the active ingredient can be employed depending upon the age and condition of the individual who is to receive the compound and for this reason This invention is concerned with novel anthranilic acid Scored tablets mpr ing 0.5 g of active ingredient or compounds containing a sulfamyl substituent attached to e can be summed to the P Y l P for the ymptomatlc one of the nuclear carbons, and with methods for prepa-radlustment of dosage to the mdlvldual Patlent- ThesF ing the compounds The compounds of this invention recommended dosages appear to be well below the toxic are illustrated by the following structure dose of the compounds as evidenced by the fact the t acute intravenous LD in mice of each of the components 2-carboxy-5-chloro-4-sulfamylacetanilide and 2-carboxy- N-Y 5-chloro-4-sulfamylaniline is greater than 600 mg./kg. R l and no toxic reactions were observed when either of these -COZ compounds was administered to dogs, intravenously, at HENS 02 dosages up to 15 mg./kg.

The diuretic properties of the novel compounds of this and includes he alkali metal nd alk line e r h metal invention make them particularly useful in the treatment salts thereof wherein R is a hal g n, SliCll as Chlorine, of congestive heart failure and other pathological condibfomifie, fluorine and the like, a lower alliyl radical tions which produce an edematous condition in the body, Vantageously having from l0 5 Carbon atoms, a lOWfiI or which produce an imbalance in the electrolyte concenalkoxy radical al advantageously having m 1 to 5 tration in the body as, for example, those in which an carbon atoms in the alkyl portion of the radical r a abnormal retention of sodium occurs. or all amino up; R2 is y og a lower alkyl The novel sulfamyl-anthranilic acids of this invention ladiilal having advantageously from t0 5 Carbon 0 else. are useful as intermediates in preparing 4-quinaz- Y is hydrogen, a lower alkyl radical having from olone derivatives which also possess diuretic, natriuretic carbon atoms, a lower alkanoyl having from 1 t0 1210a? and/ or saluretic properties. The conversion of the sulfbon atoms, a moildlillcleali afoyl radical Suchas amyl-anthranilic acids to the 4-quinazolones is described z y d and Z representshydroxv, a lower o y in detail in my United States patent application filed congfollP llaViIig advantageously from 1 i0 5 Carbbn fllOIIlS, currently, and having the Serial No. 710,386. In general, the amino Q P, a mono- O di-alkYla-iilind group each the sulfamyl-anthranilic acids of this invention are heated alkyl Subsiiiilent Preferably having from 1 l0 '3 carbon 0 with formamide or ethyl orthoformate to form the coraioms, a P p y 'PY'FIOlidYl, of a lnol'plloliiiyl responding 4-qui11azolone. The sulfamyl-anthranilic acids ical wherein the carboxyl group has been converted to a The novel Compounds of h invention a usefulpllarcarbamyl and an acyl group is attached. to the amino macotllerapeuiic agents Particularly bficause of their nitrogen can be cyclized to a 4-quinazolone by heating. uretic, natriuretic, and/or saluretic properties (herein- The novel anthranilic acids of this invention can be after referred to as diuretic properties). They can be adprepared by one or more of the methods illustrated below.

2 r l l u-cos= A 1 s X CH3 coon I a) x h 5 I) x H l1. clso 'a 1. ClSOgH 2. NH 2 7 R2 5 R2 2. NH; {li 2 7 $2 1 i l-con R i R R "c=o n *W R 0nd mnorxsrs Jermaine, 1

H3 003 COOH I 6021111:

HzNSOg KQNSOZ HaNSOg U HQNSQ; HZNSOZ III IV V: A

ALCOHOL Acn) PC15' was or 2. NR3 or an an AMIN'E AMINE 2 R2 R3 i R R0 1 l l con 1 l'i-X y R N-CON R5 con CO Alk coca Hells 2 112N502 HgNSOz R HzNSQz VIII- V vir B X i- H or ---CQR R and R H or lower alkyl alkyl halocarbonate.

v I The su lfamyl-ahthranilic acid compound, III, can be prepared either from a Z-methylacylanilide I(a) or from the anthranilic acid, I(b), wherein one or the other of these starting materials is a known compound. Either of these routes of synthesis can be employed in substantially every case although when R is a methyl radical it is preferred to employ starting material I(b) in order to avoid oxidizing the methyl radical when converting Compound II to Compound III.

As can be seen from the above reaction schemes, the preparation of the sulfamyl-anthranilic compound illustrated by the generic structure wherein Y is hydrogen, 1s best accomplished by hydrolyzing Compound III to remove the N-acyl group thus forming Compound IV. The

amides of Compound IV then can be made by initially preparing the sulfamyl-isatoic anhydride, VI, byheating the sulfamyl-anthranilie acid IV with the appropriate The amide then is prepared from the sulfamyl-isatoic anhydride, VI, by reaction with ammonia or an amine.

However, when it is desired that Y in the generic structure of the compounds be an acyl 'substituent then the N-acyl Compound III can be converted to the acid chloride and subsequently treated with ammonia or an amine to form the amide.

When R and Y in the generic structure each are to be an alkyl radical, these compounds are prepared by alkylation of the appropriate Z-methylor 2-carboxy-N-alkylaniline compound and substituting these dialkylanilines for Compounds I(a) or I(b) in the reactions described herein.

The conversion of the Z-methylaniline, Compound I(a), to the Z-methylsulfamylaniline, Compound II, is accomplished by first chlorosulfonating Compound I(a) with chlorosulfonic acid advantageously employing an excess of a molar equivalent of chlorosulfonic acid and preferably heating the reaction mixture at between about 601J0 C.

The sulfonyl chloride derivative of I(a) then is treated with ammonia, preferably between about 0 C. to room temperature, and then heating the reaction mixture advantageously on the steam bath thus forming the Z-methmonium hydroxide, liquid ammonia, or by dissolving the sulfonyl chloride in an organic solvent and bubbling ammonia gas into the solution to form the sulfamyl derivative.

The 2-methyl group of the 2-methyl-4-sulfamylaniline Compound II, then is oxidized to the carboxyl group preferably by heating at about 100 C. a reaction mixture containing Compound II, potassium permanganate and magnesium sulfate. The reaction mixture preferably is maintained at a neutral pH to avoid the removal of the N-acyl radical, and the reaction is continued until the characteristic color of the permanganate disappears.

As mentioned above, the reactions described above for the conversion of Compound I(a) to Compound III can be employed with any of the intermediates needed to prepare the sulfamyl-anthranilic acids of this invention; although when R represents a methyl radical it is preferable to employ a starting material of the type represented by structure I( b). In those instances Where the N-acyl derivative of either Compound I(a) or I(b) is not readily available, it can be prepared from the appropriate aniline compound by known acylation procedures.

Any of the 'sulfamyl-anthranilic acid compounds of this invention, and particularly those wherein R is the methyl group, can be prepared from the N-acylanthranilic acids I(b).

The chlorosulfonation and amidation, 9f CQ PW l 1 to 5 carbon atoms, 1n the presence of hydrogen chloride thus forming Compound V wherein X is hydrogen I(b) to fonn Compounds III or IV is carried out in substantially the same manner described a ove for the conversion of the Z-methyl-aniline compound, I(a), to the Z-methylsulfamylaniline Compound II.

Compound III then can be hydrolyzed to the sulfamyl-anthranilic acid, Compound IV, by any of the usual methods such as by hating on the steam bath in the presence of hydrochloric acid or refluxing a mix- 'chloric acid.

The amides of the sulfamyl-anthranilic a ids wherein in the generic structure R is hydrogen or a lower alkyl and Z is hydrogen can be prepared from Compound IV.

The amide derivatives of Compound IV are prepared by heating the 2-carboxy-sulfamylaniline, Compound IV, with an alkyl halocarbonate to form the sulfamyl-isatoic anhydride, VI, and (2-carbalkoxy-sulfamylphenyl)alkylcarbamate, A. Compounds VI and A can be separated by taking advantage of their diiferent solubilities in dioxane. The sulfamyl-isatoic anhydride, VI, which is insoluble in dioxane, then is separated and reacted with ammonia or an amine to form a mixture of Z-carbamylsulfamyl-aniline, VII, and (2-carboxy-sulfamylphenyl) urea, B, which can be separated by virtue of their solubility coefficients in aqueous ammonia; the insoluble Compound VII then can be recovered by any of the wellknown procedures, as by filtration and the like. Amidation of Compound VI advantageously is effected by stirring or shaking a mixture of Compound VI with ammonium hydroxide or other forms of ammonia, as aqueous or alcoholic ammonia, liquid ammonia, or ammonia gas or with the selected amine at room temperature or at slightly elevated temperature for from 5-8 hours and then removing the excess ammonia or amine in vacuo. At least two equivalents of ammonia or the selected amine can be used although in practice an excess generally is employed as the excess will not interfere with thereaction and the cost is not significant.

The carboxamides of Compound III, that is the 2-carboxy-sulfamylacylanilides, and the carboxamides of 2- carboxy-sulfamyl-N-alkylaniline and of 2-carboxy-sulfamyl-N,N-dialkylaniline are prepared using the appropriately substituted sulfamyl-anthranilic acid and converting it to the acid chloride with a chlorinating agent selected from phosphorus pentachloride, phosphorus trichloride, thionyl chloride, sulfuryl chloride, and the like, advantageously at room temperature or at slightly elevated temperatures. The reaction carries through in the presence of a solvent such as benzene, toluene, dioxane and the like, and the anthranilic acid chloride thus obtained then is treated with ammonia or an amine to form the carbamyl derivative, VIII. Ammonia in substantially any form, such as those recited above, can be employed either with or without a solvent and advantageously at room temperature. When an amine is used, the reaction preferably is conducted in the presence of a solvent and either at room or slightly elevated temperatures. Whether ammonia or an amine is used to form the carbamyl derivative VIII, at least two equivalents are used although an excess can and usually is employed without interferring in'any way with the successful amidation of the anthranilic acid chloride.

The esters of Compound HI or Compound IV advantageously are prepared by reacting the selected sulfamylanthranilic acid, III or IV, with an alcohol having from or an acyl radical.

stirring over 30 minutes.

5 sodium, potassium, lithium, or the like salts, can be prepared by this method or by other methods known to organic chemists. The alkaline earth metal salts are prepared by replacement of the alkali metal by an alkaline earth metal by well known procedures.

While the above discussion outlines general methods suitable for the preparation or" the sulfamyl-anthranilic acid compounds of this invention, other methods can, of course, be employed. Also, modifications can be made in the procedural steps described above to improve the conditions for the preparation of any particular compound it is desired to prepare. It is to be understood, therefore, that the following examples, which more fully describe the preparation of the compounds of this invention, are illustrative of the methods which can be employed for the preparation of the novel compounds of this invention and are not to be construed as limiting the invention to the particular methods or the particular compounds specifically described.

EXAMPLE 1 Z-carboxy-5-chlor0-4-sulfamy lacetanilide Step A.A solution of 18 g. of 5-chloro-2methylacetanilide in 50 ml. of chlorosulfonic acid is heated on the steam bath for 45 minutes, cooled, and poured onto ice. The solid is collected on a filter and transferred to a beaker. Ammonium hydroxide (50 ml.) is added and the mixture heated on the steam bath for 1 hour and then cooled in an ice bath. The solid is collected and recrystallized from a 50% alcohol-water mixture to give S-chloro-2-rnethyl-4-sulfamylacetanilide, M.P. 262- 263 C.

Analysis calculated for C H ClN O S: C, 41.14; H, 4.22; N, 10.66. Found: C, 41.16; H, 4.41; N, 10.66.

Step B.A mixture of 31.5 g. of the thus obtained compound, 37.2 g. of magnesium sulfate, and 52.8 g. of potassium permanganate in 2,800 ml. of water is heated under reflux with stirring for 5 hours. Sodium carbonate (51 g.) is added portionwise with caution and the solu- EXAMPLE 2 Z-carboxy-S -ch Zr0-4-sul famy lam'l i ne A suspension of 10 g. of Z-carboxy--chloro 4-sulfamylacetanilide, obtained as described in Example 1, in a mixture of 100 ml. of concentrated hydrochloric acid and 40 ml. of ethanol is heated under reflux for -15 minutes. The solution is diluted with water (50 ml.) and cooled in an ice bath. The crystalline precipitate is col lected on the filter and recrystallized from alcoholwater yielding 2-carboxy-5-chloro-4-sulfamylaniline, M.P. 267 C. (dee).

Analysis calculated for CqH7C1N2O4SI C, 33.54; H, 2.82; N, 11.18. Found: C, 33.89; H, 3.15; N, 11.15.

EXAMPLE 3 Z-N-ethylcarbamyl-5-chl0r0-4-sulfamylacetanilicle A suspension of 30 g. of Z-carboxy5-chloro4-sulfamylacetaniline (prepared as described in Example 1, Steps A and B) and 21 g. of phosphorus pentachloride in 300 ml. of benzene is stirred at room temperature for 1-2 hours. The mixture is filtered and the precipitate washed with 100 ml. of hot benzene. To the combined benzene extracts, cooled in an ice bath, a solution of 25 g. of ethylamine in 100 ml. of anhydrous ether is added with After one hour at room temperature the solvent is removed in vacuo and theresidue 6 washed with water and crystallized from aqueous alcohol to give Z-N-ethylcarbamyl-S-chloro-4-sulfamylacetanilide.

EXAMPLE 4 2-carboxy-5-chZ0r0'4-sulfamyl-N-methylaniline By replacing the 5-chloro-2-methylacetanilide employed in Example 1, Step A, by anequirnolecular quantity of 2-carboxy-5-chloro-N-methylaniline and following substantially the same procedure described in Example 1, Step A, there is obtained Z-carboxy-5-chloro-4-sulfamyl- N-methylaniline.

EXAMP E 5 2-carb0xy-5-methoxy-4-sulfamylaniline By replacing the 5-chloro-2methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of 2-cafboxy-S-methoxyanilirie and following substantially the same procedure described in Example 1, Step A, there is obtained 2-carboxy-S-methoxy-4-sulfamylaniline.

EXAMPLE 6 2-carboxy-5-methoxy-4-sulfamyl-N-methylacetanilide Step A.-2 carboxy 5 methoxy N 4 methylaniline (1 mole) is added portionwise over a period of -l0-l5 minutes to acetic anhydride (1.5 moles) cooled in an ice bath. After standing at room temperature for 1-2 hours, the mixture is heated on the steam bath for 30 minutes and then cooled in an ice bath. Cold water (1 liter) is added and the product taken up in ether, washed with water, dried over sodium sulfate and evaporated to dryness on the steam bath yielding Z-carboxy-S- methoxy-N-methylacetanilide.

Step B.--By replacing the 5-chloro-2-methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of the product obtained in Step A above, and following substantially the same procedure described in Example 1, Step A, there is obtained Z-carboxy-S-methoxy-4-sulfamyl-N-methylacetanilide.

EXAMPLE 7 N -ethylcarbamy l-5 -meth0xy-4 sul famy l-N methylacetanilide By replacing the 2-carboxy-5-chloro-4-sulfamylacetanilide employed in Example 3, by an equimolecular quantity of the 2-carboxy-5-methoxy4-sulfamyl-N-methylacetanilide obtained as described in Example 6 above, and following substantially the same procedure described in Example 3, there is obtained Z-N-ethylcarbamyl-S- methoxy-4-sulfamyl-N-methylacetanilide.

EXAMPLE 8 V Z-carboxy-S-nitr0-4-sulfamylaniline I By replacing the 5-chloro-2-methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of 2-carboxy-5-nitroaniline and following substantially the same procedure described in Example 1, Step A, there is obtained Z-carb'oxy-5-nitro-4-sulfamylauiline.

EXAMPLE 9 Z-carboxy-5-nitro-4-sulfamyl-N-methylacetanilide By replacing the 5-chloro-2-methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of 2-methyl-5-nitro-N-methylacetanilide and following substantially the same procedures described in Example 1, Steps A and B, there is obtained 2-carboxy-5-nitro-4- sulfamyl-N-methylacetanilide.

EXAMPLE 11 2-carboxy-5-methyl-4-sulfamylaniline By replacing the 5 -chloro-2-methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of Z-carboxy-S-methylaniline and following substantially the same procedure described in Example 1, Step A, there is obtained Z-carboxy-S-methyl-4-sulfamylaniline.

EXAMPLE 12 Z-carboxy-S-propyl-4-sulfamylacetanilide Step A.2-rnethyl-5-propylaniline (1 mole) is added portionwise over a period of lO-15 minutes to acetic anhydride (1.5 mole) cooled in an ice bath. After standing at room temperature for 1-2 hours, the mixture is heated on the steam bath for 30 minutes and then cooled in an ice bath. Cold water (1 liter) is added and the product taken up in ether, washed with water, dried over sodium sulfate and evaporated to dryness on the steam bath to give 2-methyl-5-propylacetanilide.

Step B.-By replacing the 5-chloro-2-methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of the product obtained as described in Step A above, and following substantially the same procedures described in Steps A and B of Example 1, there is obtained 2-carboxy-5-propyl-4sulfamylacetanilide.

EXAMPLE 13 Z-carbxy-5-pr0pyl-4-sulfamylaniline The Z-carboxy--propyl-4-sulfamylacetanilide, prepared as described in Example 12, is hydrolyzed by substantially the same procedure described in Example 2 to form the corresponding 2carboxy-5-propyl-4-su1famylaniline.

EXAMPLE 14 2-carboxy-5-pfopoxy-4-sulfamylacetanilide Step A.To a solution of 165 g. of 2-methy1-5-hydroxyacetanilide in an ethano lic solution of sodium ethoxide prepared from 27.6 g. of sodium and 600 ml. of anhydrous ethanol, propylbromide (164 g.) is added dropwise over a 30 minute period. After standing at room temperature for 2 hours, the mixture is heated on the steam bath for 5 hours, cooled, filtered, and concentrated to dryness in vacuo. Crystallization of the product thus obtained from dilute alcohol gives 2-methyl-5-propoxyacetanilide.

Step B.By replacing the 5-chloro-2-methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of the thus obtained Z-methyl-S-propoxyacetanilide, and following substantially the same procedures described in Example 1, Steps A and B, there is obtained 2-carboxy-S-propoxy-4-sulfamylacetanilide.

EXAMPLE 15 2-barboxy-5-prbpoxy-4 sulfamylaniline Z-carboxy-5-propoxy-4 sulfamylacetanilide prepared as described in Example 14, is hydrolyzed by substantially the same procedure described in Example 2,

to the corresponding Z-carboxy-5-propoxy-4-sulfamylan- EXAMPLE 16 Z-carboxy-S-chl0r04-sulfamyl-N-propylacetanilide Step A.To a mixture of 132 g. (1.0 mole) of 5-. phloro- Z-methylaniline and 1 liter of water containing 100 g. of sodium hydroxide cooled in an ice bath, benwater. The mixture then is cooled in an ice bath, and 'propyl iodide (170 g. is added dropwise over a 30' minute period. After stirring for 1 hour at room temperature, the mixture is extracted with ether, and the ethereal extract washed with water, dried over sodium sulfate, and evaporated to dryness on the steam bath. The residue thus obtained is dissolved in 150 ml. of acetic acid, heated under reflux with 350 ml. of concentrated hydrochloric acid for 6 hours, cooled, and after the solution is made basic with sodium hydroxide pellets, it is extracted with ether. The ethereal extract then is washed with water, dried over sodium sulfate, and distilled in vacuo to give 5-chloro-2-methyl-N-propylaniline.

Step B.By replacing the Z-methyl-S-propylaniline employed in Example 12, Step A, by an equimolecular quantity of the thus obtained 5-chloro-2-methyl-N-propylaniline, and following substantially the same procedure described in Example 12, Step A, there is obtained 5- chloro-2-methyl-N-propylacetanilide.

Step C.By replacing the 5-chloro-2-methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of the S-chloro-2-methyl-N-propylacetanilide obtained as described above, and following substantially the same procedures described in Example 1, Steps A and B, there is obtained 2-carboxy-5-chloro-4-sulfamyl-N-propylacetanilide.

EXAMPLE 17 2-carb0xy-5-chl0r0-4-sulfamyl-N-propylaniline The 2carboxy-S-ch1oro-4-sulfamyl-N-propylacetanilide, obtained as described in Example 16, is hydrolyzed by substantially the same procedure described in Example 2, to form the corresponding 2-carboxy-5-chloro-4-sulfamyl- N-propylaniline.

EXAMPLE 18 2-carboxy-5-flu0ro4-sulfamylacetanilide Step A.-By replacing the 2-methyl-5-propylaniline employed in Step A of Example 12, by an equimolecular quantity of 5-fiuoro-2-methylaniline and following substantially the same procedure described in Example 12, Step A, there is obtained 5-fluoro-2-methylacetanilide.

Step B.By replacing the 5-chloro-2-methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of S-fluoro-2-methylacetanilide obtained as described above, and following substantially the same procedures described in Example 1, Steps A and B, there is obtained 2-carboxy-S-fluoro-4-sulfamylacetanilide.

EXAMPLE 19 2-carboxy-5-fluoro-4-sulfamy[aniline The 2-carboxy-5-fluoro-4-sulfamylacetanilide, obtained as described in Example 18, is hydrolyzed by substantially the same procedure described in Example 2 to form the corresponding 2-carboxy-5-fluoro-4sulfamylaniline.

EXAMPLE 20 2-carboxy-4-chl0ro-5 -sulfamy lacetanilid e Step A.4-chloro-2-methylacetanilide-5-sulfonyl chloride (25 g.) is added in portions over five minutes to ml. of 28% ammonium hydroxide cooled in an ice bath. After heating on the steam bath for 1 hour, the mixture is cooled, and the product collected and recrystallized from aqueous alcohol to give 4-chloro-2- methyl-5-sulfamylacetanilide.

Step B.The product thus obtained is oxidized'by substantially the same procedure described in Example 1, Step B, to form 2-carboxy-4-chloro-5-sulfamylacetanilide.

EXAMPLE 21 Z-carb0xy-4-chl0r0-5-sulfamylaniline The 2-carboxy-4-chloro-5-sulfamylacetanilide, obtained as described in Example 20, is hydrolyzed by substantially the same procedure described in Example 2 to form the corresponding 2-carboxy-4-chloro-S-sulfamylauiline. H

EXAMPLE 22 Z-carboxy-5-nitro-4-sulfamyl-N-elhylaniline .By replacing the 5-chloro-2-methylacetanilide employed in Example 1, Step A, by an equimolecular quantity of 2-carboxy-5-nitro-N-ethylaniline and followingn substantially the same procedure described in Example 1, Step A, there is obtained 2-carboxy-5-nitro-4-sulfamyl-N-ethylaniline.

EXAMPLE 23 2-carb0xy-5 -ch lr0-4-sul famyl-N -butyry lani line Step A.A solution of g. of 5-chloro-2-methylaniline in a mixture of ml. of outyric anhydride and 10 ml. of benzene is allowed to stand at room temperature for one hour. After cooling in an ice bath, the crystalline product is collected and crystallized from benzene-hexane to give 5-chloro-2-methyl-N-butyrylaniline.

Step B.By replacing the 5-chloro-2-methylacetanilide employed in Step A of Example 1, by an equimolecular quantity of the 5-chloro-Z-methyl-N-butyrylaniline obtained as described above, and following substantially the same procedures described in Steps A and B of Example 1, there is obtained 2-carboxy-5-chloro-4-sulfamyl- Nabutyrylaniline. EXAMPLE 24 2-carb0xy-5-chl0r0-4-sulfamyl-N-lauroy laniline Step A.5-chloro-2-rnethylaniline, 5 g., is dissolved in a mixture of 10 ml. oflauroyl chloride and 10 ml. of

benzene and heated briefly on the steam bath. The reaction mixture then is allowed to cool to room temperature and the solid product thus formed collected on the filter. After crystallization from a mixture of henzene-hexane, 5-chloro-2methyl-N-lauroylaniline is obtained.

Step B.The 5-chloro-2-methyl-N-lauroylaniline is chloro-sulfonated and amidated by the process described in Example 1, Step A, and the 5-chloro-2-methyl-4-sulfamyl-N-lauroylaniline thus obtained is oxidized by the process described in Step B of Example 1 to form the corresponding 2-carboxy-5-chloro-4sulfamyl-N-lauroylaniline.

EXAMPLE 25 2-N-ethylcarbamyl-5-chloro-4-sulfamyl-N-lauroylaniline By replacing the 2-carboxy-5-chloro-4-sulfamylacetanilide employed in Example 3, by an equimolecular quantity of the 2-carboxy5-chloro-4-sulfamyl-N-lauroylaniline obtained as described in Example 24, and following substantially the same procedure described in Example 3, there is obtained 2-N-ethylcarbamyl-S-chloro- 4-sulfamyl-N-lauroylaniline.

EXAMPLE 26 2-carb0xy-5-chl0r0-4-sulfamyl-N-benzoylaniline By replacing the lauroyl chloride employed in Example 24 by an equal quantity of benzoyl chloride and following substantially the same procedures described in Example 24, Steps A and B, there is obtained 2-carboxy- 5-chloro-4-sulfamyl-N-benzoylaniline.

EXAMPLE 27 Z-N-ethylcarbamyl-5-chl0r0-4-sulfamyl-N-benzoy[aniline By replacing the 2-carboxy5-chloro-4-sulfamylacet- :anilide employed in Example 3 by an equimolecular quantity of the 2 -carboxy-5-chloro-4-sulfamyl-N-benzoylaniline obtained as described in Example 26, and

following substantially the same procedure described in Example 3, there is obtained Z-N-ethylcarbamyl-S-chloro- EXAMPLE 28 Z-Carbamyl-5-chl0ro-4-sulfamylaniline Step A.-A mixture of 10 g. of 2-carboxy-5-chloro-4- C. (dec.).

Analysis calculated for C H ClN O S: C, 34.73; H,

Found: C, 35.10; H, 2.05; N, 10.18. The filtrate from the reaction mixture is concentrated to dryness in vacuo and the residue crystallized from alcohol to give (Z-carbethoxy-S-chloro-4-sulfamylphenyl)urethane, M.P. 219-221 C.

Analysis calculated fQr C12H15C1N20SZ C, H, 4.31; N, 7.99. Found: C, 41.37; H, 4.14; N, 7.95.

Step B.4-chloro-S-sulfamylisatoic anhydride (4.5 g.) is dissolved in 25 ml. of cold 28% ammonium hydroxide and allowed to stand at room temperature for thirty minutes. The mixture then is heated on the steam bath for 30 minutes, cooled and the solid collected on the filter. Recrystallization from aqueous alcohol gives 2- carbamyl-5-chloro-4-sulfamylaniline, M.P. 277-278 C. (dec.). Analysis calculated for C7H ClN O S: C, 33.67; H, 3.23; N, 16.83. Found: C, 33.95; H, 3.15; N, 16.80.

The filtrate from the reaction mixture is acidified and the solid collected on the filter and recrystallized from a dimethylformamide-water mixture to give (2-carboxy- 5-chloro-4-sulfamylphenyl)urea, M.P. 218 C. (dec.).

Analysis calculated for C H ClN O SIL C, 32.72; H,

2.75; N, 14.31. Found: C, 33.05; H, 2.86, N, 14.31.

EXAMPLE 29 5 -amin0-2-carb 0xy-4-sul famylaniline Asolution of 3.0 g. of 2-carboxy-5-nitro-4-sulfamylaniline, prepared as described in Example 8, in 600 ml. of a 50% alcohol-water mixture is shaken in an atmosphere of hydrogen with 400 mg. of platinum oxide catalyst until hydrogen absorption ceases. The catalyst is removed by filtration and the solution concentrated to dryness in vacuo. Crystallization of the residue from a 50% alcohol-water mixture yields 5-amino-2-carboxy- 4-sulfamylaniline.

EXAMPLE 30 2-carboxy-5-chl0r0-4-sulfamyl N,N-methylpr0py[aniline EXAMPLE 31 2-carbethoxy-S-chl0r0-4-sulfamylacetanilide Dry hydrogen chloride gas is bubbled through a solution of 25 g. of 2-carboxy-5-chloro-4-sulfamylacetanilide (prepared as described in Example 1, Steps A and B) in 300ml. of ethanol, cooled in an ice bath for 15 minutes.

After heating under reflux for 5 hours, the solution is concentrated to dryness in vacuo and crystallized from aqueous alcohol to give 2-carbethoxy-S-chloro-4-sulfamylacetanilide.

EXAMPLE 32 Z-carbethoxy-S-chloro-4sulfamyl-N-butyrylaniline By replacing the 2-carboxy-5-chloro-4-sulfamylacetanilide employed in Example 31, by an equimolecular quantity of the 2-carboxy-5-chloro-4-sulfamyl-N-butyrylaniline obtained as described in Example 23, and following substantially the same procedure as described in Example 31, there is obtained 2-carbethoxy-5-chloro-4-sulfamyl- N-butyrylaniline.

. EXAMPLE 33 Di-sodium salt of Z-earboxy--chl0r0-4-sulfamy[aniline 2-carboxy-5-chloro-4-sulfamylaniline, prepared as described in Example 2, is dissolved in an excess of alcoholic sodium hydroxide and the solvent then evaporated in vacuo yielding the di-sodium salt of 2-carboxy-5- chloro-4-sulfamylaniline.

The following examples described the conversion of the sulfamyl-anthranilic acids of this invention to 4- quinazolones.

EXAMPLE 34 7-chl0r0-6-sulfamyl-4-quinaz0l0ne A mixture of 5; g. of 2-carboxy-5-chloro-4-sulfamyl- I aniline, prepared as described in Example 2, and 5 g. of

f ormamide is heated at 130-140 C. for 3 hours, cooled, and diluted with 25 ml. of water. The precipitate is collected and recrystallized from alcohol-water yielding 7-chloro-6-sulfamyl-4-quinazolone, M.P. 314-315 C.

(dec.).

Analysis calculated for C H ClN O S: C, 37.00; H,

1.33; N, 16.18. Found: c, 37.26; H, 2.36; N, 16.18.

EXAMPLE 35 Y 7-chl0r0-3-ethyl-2-methyl-6-sulftzmyl-4-quinaz0l0ne 2-N-ethylcarbamyl-5-chloro-4-sulfamylacetanilide, 5 g., prepared as described in Example 3, is heated at 200- 250 C. for 2 hours, cooled, and the residue crystallized from aqueous alcohol yielding 7-chloro-3-ethyl-2-methy1-" 6-sulfamyl-4-quinazolone.

The 2-carboxy-5-chloro-4-sulfamylaniline is granulated with the starch paste and while moist passed through a No. 14 screen, dried at 45 C. for 20 hours an then passed 3 times through a No. 14 screen. The starch then is passed though a No. 90 bolting cloth onto the granulation and all ingredients are blended thoroughly. Then the magnesium stearate is passed through a No. 90 bolting cloth onto the granulation and these ingredients are blended after which the granulation is compressed into tablets using a flat, bevelled, scored punch having a thickness of 020520.005" yielding 1,000 tablets, each weighing 0.543 grams and having a hardness of 6 kgms. measured by the Monsanto Chemical Company tablet hardness tester apparatus, and a disintegration time of 5 minutes when tested on the U.S.P. tablet disintegrating apparatus (US. Pharmacopeia, 15th edition, page 937). Tablets prepared as described above are suitable for oral administration at a dosage regimen individualized for each patient by his physician.

While the above examples describe the preparation of certain illustrative compounds illustrated by the structure in column 1, lines l925, inclusive, and a certain specific dosage form suitable for administering the novel compounds of this invention in human therapy and certain methods suitable for making the sulfamyl-anthranilic acids of this invention, it is to be understood that the invention is not to be limited by these examples or by the specific reaction conditions described for the preparation of the compounds or by the specific ingredients included in the pharmaceutical preparation described, but is understood to embrace variations and modifications falling within the scope of the appended claims.

What is claimed is:

1. A sulfamyl-anthranilic acid selected from the group consisting of compounds having the general structure R2 at...

-C oz and alkali metal and alkaline earth metal salts thereof, wherein R is selected from the group consisting of halogen, lower alkyl, lower alkoxy, nitro and amino groups; R is selected from the group consisting of hydrogen and lower alkyl radicals; Y is selected from the group consisting of hydrogen, lower alkyl, lower alkanoyl, and benzoyl radicals; and Z is selected from the groupconsisiting of hydroxyl, lower alkoxy, and an amino radical.

2. A sulfamyl-anthranilic acid having the general structure C O OH HzNSOz wherein R is a halogen, and Y is a lower alkanoyl radical.

3. A sulfamyl-anthranilic acid having the general structure wherein R is a halogen, and Y is a lower alkanoyl radical.

4. 2-carboxyl-5-chloro-4-sulfamylacetanilide.

wherein R is a halogen.

6. A sulfamyI-anthranilic acid having the general formula HzNSO ooon wherein R is a halogen. p 7. 2-carboxy-5-chloro-4-sulfamylaniline.

References Cited in the file of this patent FOREIGN PATENTS Canada May 15, 1951 OTHER REFERENCES Karrer: Organic Chemistry, pp. 490-491, Elsevicr, Amsterdam (1938).

' Fahlberg et al.: Berichte Deutsche Chemische Gmllschaft, vol. 20, pp. 15961602 (1887). 

1. A SULFAMYL-ANTHRANILIC ACID SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE GENERAL STRUCTURE 